2008-04-14 04:09:29 +00:00
|
|
|
|
/*
|
|
|
|
|
* Generic audio functionality
|
|
|
|
|
*
|
|
|
|
|
* ***** BEGIN LICENSE BLOCK *****
|
|
|
|
|
* Version: MPL 1.1
|
|
|
|
|
*
|
|
|
|
|
* The contents of this file are subject to the Mozilla Public License Version
|
|
|
|
|
* 1.1 (the "License"); you may not use this file except in compliance with
|
|
|
|
|
* the License. You may obtain a copy of the License at
|
|
|
|
|
* http://www.mozilla.org/MPL/
|
|
|
|
|
*
|
|
|
|
|
* Software distributed under the License is distributed on an "AS IS" basis,
|
|
|
|
|
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|
|
|
|
* for the specific language governing rights and limitations under the
|
|
|
|
|
* License.
|
|
|
|
|
*
|
|
|
|
|
* The Original Code is the MPEG TS, PS and ES tools.
|
|
|
|
|
*
|
|
|
|
|
* The Initial Developer of the Original Code is Amino Communications Ltd.
|
|
|
|
|
* Portions created by the Initial Developer are Copyright (C) 2008
|
|
|
|
|
* the Initial Developer. All Rights Reserved.
|
|
|
|
|
*
|
|
|
|
|
* Contributor(s):
|
|
|
|
|
* Amino Communications Ltd, Swavesey, Cambridge UK
|
|
|
|
|
*
|
|
|
|
|
* ***** END LICENSE BLOCK *****
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
#include <errno.h>
|
|
|
|
|
#include <string.h>
|
|
|
|
|
|
|
|
|
|
#include "compat.h"
|
2009-02-23 21:05:51 +00:00
|
|
|
|
#include "printing_fns.h"
|
2008-04-14 04:09:29 +00:00
|
|
|
|
#include "audio_fns.h"
|
|
|
|
|
#include "adts_fns.h"
|
|
|
|
|
#include "l2audio_fns.h"
|
2008-09-09 13:45:11 +00:00
|
|
|
|
#include "ac3_fns.h"
|
2008-04-14 04:09:29 +00:00
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Build a new generic audio frame datastructure
|
|
|
|
|
*
|
|
|
|
|
* Returns 0 if all goes well, 1 if something goes wrong.
|
|
|
|
|
*/
|
|
|
|
|
extern int build_audio_frame(audio_frame_p *frame)
|
|
|
|
|
{
|
|
|
|
|
audio_frame_p new = malloc(SIZEOF_AUDIO_FRAME);
|
|
|
|
|
if (new == NULL)
|
|
|
|
|
{
|
2009-02-23 21:05:51 +00:00
|
|
|
|
fprint_err("### Unable to allocate audio frame datastructure\n");
|
2008-04-14 04:09:29 +00:00
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
new->data = NULL;
|
|
|
|
|
new->data_len = 0;
|
|
|
|
|
|
|
|
|
|
*frame = new;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Tidy up and free an audio frame datastructure when we've finished with it
|
|
|
|
|
*
|
|
|
|
|
* Empties the datastructure, frees it, and sets `frame` to NULL.
|
|
|
|
|
*
|
|
|
|
|
* If `frame` is already NULL, does nothing.
|
|
|
|
|
*/
|
|
|
|
|
extern void free_audio_frame(audio_frame_p *frame)
|
|
|
|
|
{
|
|
|
|
|
if (*frame == NULL)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
if ((*frame)->data != NULL)
|
|
|
|
|
{
|
|
|
|
|
free((*frame)->data);
|
|
|
|
|
(*frame)->data = NULL;
|
|
|
|
|
}
|
|
|
|
|
(*frame)->data_len = 0;
|
|
|
|
|
|
|
|
|
|
free(*frame);
|
|
|
|
|
*frame = NULL;
|
|
|
|
|
}
|
|
|
|
|
/*
|
|
|
|
|
* Read the next audio frame.
|
|
|
|
|
*
|
|
|
|
|
* Assumes that the input stream is synchronised - i.e., it does not
|
|
|
|
|
* try to cope if (for MPEG2) the next three bytes are not '1111 1111 1111'.
|
|
|
|
|
*
|
|
|
|
|
* - `file` is the file descriptor of the audio file to read from
|
|
|
|
|
* - `audio_type` indicates what type of audio - e.g., AUDIO_ADTS
|
|
|
|
|
* - `frame` is the audio frame that is read
|
|
|
|
|
*
|
|
|
|
|
* Returns 0 if all goes well, EOF if end-of-file is read, and 1 if something
|
|
|
|
|
* goes wrong.
|
|
|
|
|
*/
|
|
|
|
|
extern int read_next_audio_frame(int file,
|
|
|
|
|
int audio_type,
|
|
|
|
|
audio_frame_p *frame)
|
|
|
|
|
{
|
|
|
|
|
switch (audio_type)
|
|
|
|
|
{
|
2008-07-21 21:33:14 +00:00
|
|
|
|
case AUDIO_ADTS_MPEG2:
|
|
|
|
|
return read_next_adts_frame(file,frame,ADTS_FLAG_NO_EMPHASIS);
|
|
|
|
|
case AUDIO_ADTS_MPEG4:
|
|
|
|
|
return read_next_adts_frame(file,frame,ADTS_FLAG_FORCE_EMPHASIS);
|
2008-04-14 04:09:29 +00:00
|
|
|
|
case AUDIO_ADTS:
|
2008-07-21 21:33:14 +00:00
|
|
|
|
return read_next_adts_frame(file,frame,0);
|
2008-04-14 04:09:29 +00:00
|
|
|
|
case AUDIO_L2:
|
|
|
|
|
return read_next_l2audio_frame(file,frame);
|
2008-09-09 13:45:11 +00:00
|
|
|
|
case AUDIO_AC3:
|
|
|
|
|
return read_next_ac3_frame(file, frame);
|
2008-04-14 04:09:29 +00:00
|
|
|
|
default:
|
2009-02-23 21:05:51 +00:00
|
|
|
|
fprint_err("### Unrecognised audio type %d - cannot get next audio frame\n",
|
|
|
|
|
audio_type);
|
2008-04-14 04:09:29 +00:00
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
}
|
2008-06-14 16:05:00 +00:00
|
|
|
|
|
|
|
|
|
// Local Variables:
|
|
|
|
|
// tab-width: 8
|
|
|
|
|
// indent-tabs-mode: nil
|
|
|
|
|
// c-basic-offset: 2
|
|
|
|
|
// End:
|
|
|
|
|
// vim: set tabstop=8 shiftwidth=2 expandtab:
|